Feelworld FPV821 User manual

Dual Channel Receiver / Auto Search
Wireless FPV Monitor with PIP
User Manual

1
Product Overview
Dual channel automatic frequency search at the same time wireless
aerial LCD monitor is a new multi-function product, and adopts
advanced integrated circuits and High-quality new HD LCD monitor. It
integrates a high-sensitivity dual 5.8GHZ AV wireless receivers with
auto searching, aerial receiver, high-definition and PIP function monitor.
The Monitor casing compact, easy to operate, can be used for FPV
ground station, security monitoring, baby monitors, photography
viewfinder, construction site video surveillance, advertising and other
applications.
The monitor build-in battery, if you don’t install the battery, you can
use the power adapter for external power supply.
To insure best use of the unit, please read the user’s
manual carefully.
CAUTION
1. Do not use any damaged or leaking battery and please replace the
Battery immediately if it becomes weak.
2. Do not expose this product to direct sunlight, heat or humid
conditions
3. Keep away from strong light while using this product so as to
obtain the clearest and most colorful picture. Please use sun shade
for the outdoor use
4. Please avoid heavy impact or drop onto the ground.
5. Do not use chemical solutions to clean this unit. Please simply
wipe with a clean soft cloth to keep the brightness of the surface.
6. To avoid damaging the product, please do not take apart or repair
the unit by yourself without adjustable component in the unit.

2
Product Feature:
●Dual Channel RF1/RF2 receiver to receive at the same time,
high-sensitivity, strong anti-interference.
●Combine wireless 5.8G receivers with the monitor, it is
compact, and suitable for a variety of purposes.
●5.8G wireless receiver, 32-channel selection, effectively to
avoid the signal interference.
●Newest Channel Auto searching, selection via button to
improve the accuracy and convenience of channel selection.
●High brightness, contrast, anti-glare screen with a sun
shade, sunlight clearly visible.
●Equipped with RF1 / RF2 two channel AV outputs can connect
several monitors at the same time.
●RF1 Channels have PIP function, you can watch the reception
of RF2 channels at the same time.
●Front headphone monitors playback audio effects
●Build-in battery is convenient for the outdoor use without
power.
●Check Field
●Picture Screen Markers and Center Marker

3
CONTENTS
1. Product Description ----------------------------------- 4
2. Power Supply ---------------------------------------------7
3. Wireless Transmission Receiver Operation --- 8
4. Operation Instruction --------------------------------- 12
5. Parameters ----------------------------------------------- 21
6. Trouble Shooting -------------------------------------- 22

4
1. Product Description
1.1 Front Panel Features
1. Power Indicator
2. Power: Power On/Off button, long press this button for 5s
to 8s to turn On/Off the power.
3. Mode: Input signal selection button.
∧/ CH2: Directly press RF2 button is for CH 1～8
selection. In OSD is for “UP” button selection.
4. ∨/ BAND2: Press this button directly for channel RF2
BAND A/B/C/D selection. In OSD is for “DOWN” button
selection.
5. MENU: Menu key, enter or exit button in menu.

5
6. ＞/CH1: Press this button directly for channel RF1 CH 1～8
selection . When enter into menu, namely enter into
secondary menu, it is for items selection and settings
adjustment.
7. ＜/BAND1: Press this button directly for channel RF1
BAND A/B/C/D selection. When enter into menu, namely
enter into secondary menu, it is for items selection and
settings adjustment.
8. AUTO2: RF2 channel auto searching.
9. AUTO1: RF1 channel auto searching.
10. PIP: Turn on PIP (It is effective under RF1 channel，the
small image is RF2 channel)

1.
2
2
Rea
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1.
2. R
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3. R
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7.
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7
2. Power Supply
There are two versions for power supply:
2.1 Supplied by city electricity with power adapter
When the monitor connects the electricity by DC power adapter,
light is red, means it is charging, after fully charged, the charging
indicators will be off.
You can choose the power adapter (optional) which matches to the
monitor to charge the monitor. If you need to use other power adapter,
please use the qualified power supply in DC9-18V, ≧1.5A.
2.2 Build-in Battery Power Supply
This model is build-in Li-ion battery capacity: 7.4V-2200mA/h
(2Hours), after fully-charged, it can work for about 2 hours.
2.3 Li-ion Battery
●The working temperature of Li-ion battery is -20~60℃, please
don’t use battery in the place with temperature too low or too high.
The power of battery will be reduced if it is working in low
temperature environment. Please don’t use the battery in high
temperature environment, may cause battery swell then fire.
Please check the temperature of battery when it is working in high
temperature environment.
●Over- charge and over- discharge, it will cause permanent damage
to the positive pole and negative pole of batteries.
No need to over discharge then recharge every time.

8
●Period of time to do a deep charge and discharge the battery under
the protection circuit control to correct the consumption statistics,
but it will not improve your battery's actual capacity
●Please place battery in a cool place to weaken the aestivation
speed of battery, if you don’t use the battery for a long time.
●Please charge power stored in the battery to prevent self-discharge
of excessive led to excessive discharge damage if you don’t
use the battery for long time.
3. Wireless Transmission Receiver Operation
Securely assemble matched antennas on the unit’s antenna input
ports, and lock on the buckle.
3.1 Channel selection
Wireless transmitter channel and receiver channel must be
strictly consistent; otherwise it will not receive a transmitter

9
signal. (Frequency range of each region are different, please
check the unit’s paste instructions).
This unit can automatically search for 32 receiver channels. When
multi transmitters and receivers work together at the same time,
please choose different transmission channels, to avoid co-channel
interference.
Note! The channels must be supporting the
transmitter

10
3.2 Auto Searching:
Confirm that the transmitter has entered a normal working
condition.
Confirm that build in battery monitor has been fully charges or has
connected via DC power supply, long press “POWER” for 5s～8s, the
monitor will enter the working state.
Then press “MODE” and select “RF1” signal input. And press
“AUTO1”, “RF1Searching ON” will display on the bottom and middle
part of the screen, which means the monitor starts to auto searching,
when the screen on the upper left corner shows the BAND: X CH: X
and image display at the same time, which means that receiving RF1
Channel has finished searching and detect the signals from
transmitters, now users can enter into RF2 channel auto searching.
Press “MODE” and select “RF2” signal input. And press “AUTO2”,
“RF2 Searching ON” will display on the bottom and middle of the
screen, which means the monitor starts to auto searching.
When the screen on the upper right corner shows the BAND: X CH:
X and image display at the same time, which means that receiving
RF2 Channel has finished searching and detect the signals from
transmitters.

11
3.3 Manual channel search and Settings.
Confirm that the transmitter has entered a normal working
condition.Turn on power of the monitor to the working state.
Press “MODE” and select “RF1”, “RF1 BAND:X CH:X” will display on
the upper left corner of the screen, then press “＜/BAND1” to switch
RF1 channel BAND A/B/C/D, and press “＞/CH1” to select RF1
CH1~8. If the transmitter works, frequency of receiver and transmitter
are in agreement, the receiver will receive the signal sent from the
transmitter and displayed on the monitor.
Press “MODE” and select “RF2”, “RF2 BAND:X CH:X” will display on
the upper right corner of the screen, then press “∨/BAND2” to switch
RF2 channel BAND A/B/C/D, and press “∧/CH2” to select RF2
CH1~8 . If the transmitter works, frequency of receiver and
transmitter are in agreement, the receiver will receive the signal sent
from the transmitter and displayed on the monitor.
Note: The effect of receiving and the distance has a great
relationship with the reception power of the transmitter and the
receiver venues. If the reception is poor, the antenna can be
replaced with three leaves, four leaves antenna or panel antenna.
Please note that the antenna and receiving should be same
frequency when replace the antennas.

12
4. Operation Instruction
4.1 Button instruction
MODE Input Signal RF1/RF2/HDMI selection button
∧/CH2 RF2 CH1～8 channel switch;
InOSD is for “UP” button selection.
∨/BAND2 Press this button directly for channel RF2 BAND
A/B/C/D selection; In OSD is for “DOWN”
button selection.
MENU Menu key
＞/CH1 Press this button directly for channel RF1 CH1～
8 selection . When enter into menu, it is for
items selection and settings adjustment.
＜/BAND1 Press this button directly for channel RF1 BAND
A/B/C/D selection . When enter into menu, it is
for items selection and settings adjustment.
AUTO2 RF2 channel auto searching.
AUTO1 RF1 channel auto searching.
PIP Turn on PIP (It is effective under RF1 channel)

4.
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